Refactor MHTMLGenerator to allow getting sending the data to a file descriptor.

content/browser/web_contents/web_contents_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 257 matching lines @@
   virtual InterstitialPage* GetInterstitialPage() const OVERRIDE;
   virtual bool IsSavable() OVERRIDE;
   virtual void OnSavePage() OVERRIDE;
   virtual bool SavePage(const base::FilePath& main_file,
                         const base::FilePath& dir_path,
                         SavePageType save_type) OVERRIDE;
   virtual void SaveFrame(const GURL& url,
                          const Referrer& referrer) OVERRIDE;
   virtual void GenerateMHTML(
       const base::FilePath& file,
-      const base::Callback<void(const base::FilePath&, int64)>& callback)
+      const base::Callback<void(int64)>& callback)
           OVERRIDE;
   virtual bool IsActiveEntry(int32 page_id) OVERRIDE;
 
   virtual const std::string& GetContentsMimeType() const OVERRIDE;
   virtual bool WillNotifyDisconnection() const OVERRIDE;
   virtual void SetOverrideEncoding(const std::string& encoding) OVERRIDE;
   virtual void ResetOverrideEncoding() OVERRIDE;
   virtual RendererPreferences* GetMutableRendererPrefs() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void SystemDragEnded() OVERRIDE;
@@ skipping 675 matching lines @@
   // Maps the ids of pending image downloads to their callbacks
   typedef std::map<int, ImageDownloadCallback> ImageDownloadMap;
   ImageDownloadMap image_download_map_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_